Search strategy
Two researchers (YQY and XC) systematically searched PubMed, Embase, the Cochrane Library, CINAHL, and three additional Chinese literature databases, namely, CNKI, CBM and WanFang databases from inception to 25 June 2021 using a comprehensive search strategy (Appendix S1). We also searched ClinicalTrials.gov to identify ongoing or unpublished eligible trials. Additionally, reference lists of included articles and relevant systematic reviews were also screened.